Michael H. Davidson
CIK 1573785 · View on SEC EDGAR ↗
Insider
First SEC filing: Jan. 2, 2025 · Latest: June 12, 2026
On this page
- Insider at Companies where this person is a reporting insider.
- Insider transactions Every share this person bought or sold, from Form 4 filings.
- Derivatives Options and other derivative holdings reported by this person.
- Initial holdings The stakes this person held when they first started reporting.
- Compensation Executive pay disclosed in company proxy statements.
Insider at
Insider transactions
0 buys (P)
9 sells (S)
Net:
$-25,328,350
+ 19 non-open-market transactions below
last 12 months, based on the transactions shown below
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
19 other filings hidden
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| March 2, 2026 | NAMSW | S | 443,707 | $33.25 | $14,753,258 | 174,144 Direct | -71.81% | Disposed | -51.9% (price as of 2026-08-19) |
| Feb. 26, 2026 | NAMSW | S | 17,924 | $34.44 | $617,303 | 174,144 Direct | -9.33% | Disposed | -53.5% (price as of 2026-08-19) |
| Feb. 26, 2026 | NAMSW | S | 165,408 | $33.63 | $5,562,671 | 477,783 Direct | -25.72% | Disposed | -52.4% (price as of 2026-08-19) |
| Feb. 25, 2026 | NAMSW | S | 1,300 | $36.68 | $47,684 | 459,859 Direct | -0.28% | Disposed | -56.4% (price as of 2026-08-19) |
| Feb. 25, 2026 | NAMSW | S | 10,436 | $35.96 | $375,279 | 461,159 Direct | -2.21% | Disposed | -55.5% (price as of 2026-08-19) |
| Feb. 25, 2026 | NAMSW | S | 46,517 | $35.11 | $1,633,212 | 471,595 Direct | -8.98% | Disposed | -54.4% (price as of 2026-08-19) |
| Feb. 24, 2026 | NAMSW | S | 3,161 | $36.46 | $115,250 | 459,859 Direct | -0.68% | Disposed | -56.1% (price as of 2026-08-19) |
| Feb. 24, 2026 | NAMSW | S | 61,547 | $36.13 | $2,223,693 | 463,020 Direct | -11.73% | Disposed | -55.7% (price as of 2026-08-19) |
| Jan. 7, 2026 | NAMSW | S | 11,582 | — | — | 378,859 Direct | -2.97% | Disposed | (price as of 2026-08-19) |
| March 26, 2025 | NAMSW | S | 12,258 | — | — | 390,441 Direct | -3.04% | Disposed | (price as of 2026-08-19) |
| Aug. 20, 2024 | NAMSW | P | 5,000 | $16.27 | $81,350 | 209,784 Direct | +2.44% | Acquired | -1.7% (price as of 2026-08-19) |
| June 20, 2024 | NAMSW | P | 5,000 | $17.26 | $86,300 | 204,784 Direct | +2.50% | Acquired | -7.3% (price as of 2026-08-19) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II)
Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| June 10, 2026 | BIOA | Stock Option (Right to Buy) | Common Stock (22,000) | $15.48 | June 9, 2036 | 22,000 | Acquired |
| March 2, 2026 | NAMSW | Option (right to buy) | Ordinary Shares (443,707) | — | July 6, 2031 | 443,707 | Disposed |
| Feb. 26, 2026 | NAMSW | Option (right to buy) | Ordinary Shares (183,332) | — | July 6, 2031 | 183,332 | Disposed |
| Feb. 25, 2026 | NAMSW | Option (right to buy) | Ordinary Shares (58,253) | — | July 6, 2031 | 58,253 | Disposed |
| Feb. 24, 2026 | NAMSW | Option (right to buy) | Ordinary Shares (64,708) | — | July 6, 2031 | 64,708 | Disposed |
| Jan. 7, 2026 | NAMSW | Option (right to buy) | Ordinary Shares (364,000) | $35.45 | Jan. 7, 2036 | 364,000 | Acquired |
| March 26, 2025 | NAMSW | Restricted Stock Unit | Ordinary Shares (38,394) | — | — | 38,394 | Disposed |
| March 26, 2025 | NAMSW | Restricted Stock Unit | Ordinary Shares (38,394) | — | — | 38,394 | Acquired |
| Jan. 6, 2025 | NAMSW | Option (right to buy) | Ordinary Shares (670,467) | $25.85 | Jan. 6, 2035 | 670,467 | Acquired |
| Oct. 9, 2024 | NAMSW | Warrant (right to buy) | Ordinary Shares (15,000) | $11.50 | Nov. 23, 2027 | 15,000 | Disposed |
| Jan. 1, 2024 | NAMSW | Option (right to buy) | Ordinary Shares (1,039,939) | $11.17 | Jan. 1, 2034 | 1,039,939 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 13 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Jan. 2, 2025 | SLN | Ordinary Shares | 12,993 | Direct |
| Jan. 2, 2025 | SLN | Share Option (Right to Buy)→ Ordinary Shares (48,000) | 48,000 | Direct |
| Jan. 2, 2025 | SLN | Share Option (Right to Buy)→ Ordinary Shares (48,000) | 48,000 | Direct |
| Jan. 2, 2025 | SLN | Share Option (Right to Buy)→ Ordinary Shares (48,000) | 48,000 | Direct |
| Sept. 25, 2024 | BIOA | Stock Option (Right to Buy)→ Common Stock (33,986) | 33,986 | Direct |
| Jan. 25, 2024 | NAMSW | Warrant (right to buy)→ Ordinary Shares | — | Direct |
| Dec. 29, 2023 | NAMSW | Ordinary Shares | 199,784 | Direct |
| Dec. 29, 2023 | NAMSW | Ordinary Shares | 608,779 | Indirect |
| Dec. 29, 2023 | NAMSW | Option (right to buy)→ Ordinary Shares (1,021,485) | 1,021,485 | Direct |
| Dec. 29, 2023 | NAMSW | Option (right to buy)→ Ordinary Shares (2,440,538) | 2,440,538 | Direct |
| Dec. 29, 2023 | NAMSW | Option (right to buy)→ Ordinary Shares (989,267) | 989,267 | Direct |
| June 15, 2021 | TENX | Common Stock | 96,645 | Direct |
| June 15, 2021 | TENX | Series B Preferred Stock | 512 | Direct |
Compensation (DEF 14A)
Matched by name from proxy statements (DEF 14A) — verify against the filing.
| Fiscal year | Salary | Bonus | Stock awards | Option awards | Non-equity incentive | Pension change | Other | Total |
|---|---|---|---|---|---|---|---|---|
| 2025 | $646,152 | — | $3,571,146 | $8,931,566 | $474,922 | — | $18,068 | $13,641,854 |
| 2024 | $621,300 | — | — | — | $497,040 | — | $3,897 | $6,469,297 |
| 2023 | $569,000 | $313,000 | — | $4,923,558 | — | — | — | $5,832,558 |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.